Feature.Waterproof.This timer has a beautiful appearance, more comfortable and accurate timing. It is not only waterproof, shock-proof and drop-proof design, but also strengthens the internal structure, so it can be used normally even in rainy days.Easy to operate.This timer is simple and convenient to operate, with complete functions, side buttons, four-button operation, and low power consumption. There are functions such as stopwatch timing, time display, calendar and so on.With lanyard.The timer is equipped with an original lanyard, the length of the strap is moderate, convenient to use, not easy to lose and fall, tight and firm, not easy to loosen and fall, and the appearance is exquisite.Good material.The sports timer is made of ABS plastic, dynamic shape, non-slip design, high strength, anti-drop, corrosive texture, comfortable grip, scratch-resistant, wear-resistant, strong and durable.Application.The timer button is comfortable and moderately flexible, suitable for sports running track and field referee coach training timer competition, professional fitness waterproof referee electronic stopwatch.Specifications:Material: ABS+electronic components.Color: Yellow.Power supply: Built-in 1*AG13 lithium battery.Battery voltage: 1.5V.Memory: Dual path (no memory).Timing accuracy: 1/100 second.Long timekeeping: 23:59:59.Function operation:B key:START/STOP is used to start or stop the running seconds in the "run second function", and to adjust the value when setting the time and alarm.A key: MODE, used to switch modes (note: this stopwatch cannot be turned off).4 major structures:Clock function interface, stopwatch function interface, clock adjustment interface, alarm clock function interface.Item size: 8.9*6.5*1.8cm/3.5*2.55*0.71inch(L*W*H).Weight: 125g/4.41oz.